Personally I loathe people who use their phone speaker in a restaurant (or doctor's office, etc)
but I made my peace with it by adapting:
https://www.amazon.com/dp/B008MCTOPU (3m ear classic 33 NRR earplugs)
The perpetrators never notice me putting in the earplugs, but others do and smile "I know, right?"
(although another adaptation might be putting on a disney princess song or maybe ukulele music. can you steer the sound?)
If you find yourself getting annoyed by someone being actively engaged in a space, then maybe you have the problem, not them, and maybe you should chill out.
That means very little. We have no indication whether they were truly being disruptive or whether this person was just being hypersensitive. The entire point of the post is recognizing that your personal feelings are not privileged truth. You know nothing outside of your own head.
I hope that if you read what I wrote again[0] you'll realize that's a non-sequitur.
[0] My mid-write edits might have clarified.
Here's a word substitution experiment to contemplate: Person A is angry because they noticed person B kissing person C openly in public. Which person is at fault? If you want, we can even say that the kiss was louder than anyone else's kiss, though what that means exactly in this scenario exists purely inside your head.